“…Given the number of adverse impacts related to income inequality, a comprehensive study on inequality is justified to formulate policies that can alleviate inequality and ameliorate these adverse effects in the future. Country-specific regional disparity and income decomposition studies have been widely reported for developed (Karakoc, 2017;Kennedy et al, 2017;Kisiała and Suszyńska, 2017;Okabe and Kam, 2017;Bittencourt et al, 2019;Blanco and Ram, 2019) and developing (Choudhury and Chaterjee, 2016;Jang and Jeong, 2016;Paredes et al, 2016;Tian et al, 2016;Habibullah et al, 2017;Sehrawat and Giri, 2018;Calcagnini et al, 2019;Cevik and Correa-Caro, 2019;Le and Nguyen, 2019;Michálek and Výboš tok, 2019;Tchamyou et al, 2019) countries. However, to our knowledge there has been no recent study on the contributions of regional and income subgroups to international inequality for the world.…”